Stapling mechanism



S-TAPLING MEC HANI SM Original Filed March 13, 1936 2 Sheets-Sheer. 1

Aug.2,1`938. .w, D, ,PPS .1112x5331r I l sTALING MEGHANISM Original Filed March 13, 1936 2 Sheets-Sheet 2 Patented Aug. 2, 1938 i i UNiTEDN STATES PATENT OFFICE 2,125,731 STAPLING MECHANISM William D. Lipps, Frederick, Md., assignor to x Fibre Brush Company, Inc., New York, N. Y., a corporation of Delaware `Original applicationMarch 13, 1936,` SerialNo. 68,683. Divided and this application May 22, 1937, Serial No. 144,137

The invention forming the subject of the which is fulcrumed on the frame structure, the present application, (which` is a division oi my other arm 2M being pivotally connected by means co-pending application Serial No. 68,633, led of a link M to the plain face of a cam 246 fast March 13, 1936, for improvements in Brush maon the main shaft 39. Thus the plunger iS Verl chines) relates to-wire staple forming and drivtically reciprocated. 5

ing mechanism for general use, 239 designates a stationary staple former com- The object er the present invention is to proprisme a bleek through which the plunger revide novel mechanism of simple and eicient concDrOea'teS, Said blOCk having grooved inner walls `struction and` operation whereby wire staples are to which the plunger is slidably tted. This block lo' rapidly and accurately produced. is preferably composed of two mating sections /l Another object of the invention is to provide a (Figs. l and 5) WhCh are Xed in 9 Vertelly mechanism 0f the Character mentioned whereby Challlleied block 24H fastened 170 the frame structhe staples thus produced are driven in successive ture. The grOOVed inner Wells 0f the SDaGed order into wood, paper or other suitable material. members 0f the Staple former are adapted t0 rele with these objects in view, and others which Ceive and support the depending less of a staple i5 will appear, my invention embodies novel fee- (S) which is formed and seated between such tures of construction and combinations which will members, es OUOWS be hereinafter described, the scope of the inven- A Short mandrel e 0f appropriate ferm iS p tion being expressed in the appended @mime movable in a vertical orbital path traversing the e0 In the drawingsvertical slot of the staple former. This mandrel 20 Figure 1 is a sectional elevation of staple form- DrejeCtS endWSe from a bar '255 WniCh iS DVOed. ing and driving mechanism embodying the princiet 255, between a Deir 0f depending lugs 26'! 0n ple of my invention, the foot 263 of a pendant lever 259, whereof the Fig. 2 is a partial horizontal section, in a plane Upper end iS SlO'ed aS al? 210 and Sldably lll- ".5 through the plunger slide, as on the line 2 .2 of crumed on a pin 2li Xed to a bracket 212 on the 25 Fig. l. Trame structure. The bar 265 has a slight ver- Fig, 3 is a, perspective view of Wire feeding and tical rocking motion, and is maintained with its cutting devices,` together with an orbitally movacting 0r mandrel end reslently reSed by Ineens able mandrel which eoacts therewith and with a 0I e spring Se? Which is interposed between the xed staple former to shape succeeding staples bar and the heel of the lever foot 258. The lower 30 inthe path of the plunger. forward portion of the lever is pivotally con- Fig. 4 is a sectional rear elevation of the wire neeted to a Crank 368 on one end of e short lonee feeding and cutting devices, the mandrel and tudinal shaft 359 having its bearings in a bracket associated plunger guide with its staple former. 319 on one side of the frame structure. Fast on Fig. 5 is an enlarged view of the lower end of a, the other end of the shaft 3%9 is a bevel gear 3l! plunger guide constituting the staple former, in mesh with a similar gear 312 on a short transshowing the adjacent Xed members of the wire verse shaft 213 having its bearings in the bracket cutter, and also showing a staple as produced in 311i and also in a bracket 274 also mounted on the staple former. the frame structure. Fast on the shaft 213 is a Fig, d is a horizontal section, as on the line Sprocket wheel 2id which is connected by means 4() t-- of Fig. 5, but showing the movable cutter of a chain 2lb with a similar wheel 211 on a member in co-operative relation to the xed cutter short shaft M0 suitably mounted below the main member and the leading end of the staple wire as shaft. The shaft M0 has Xed thereon a sprocket severed preparatory to its insertion in the staple wheel E42 which is connected with and driven `former about the mandrel. from a similar wheel |43 on the main shaft by a 45 Fig. 7' is a transverse vertical section through chain ille. Hence the shaft Seil is continuously the wire feeding wheels and adjuncts. rotated and the crank 368 thereon actuates the Referring to the drawings, 35 designates a porlever 26e in a manner to impart a vertical orbital tion of a supporting frame, and 39 designates the movement to the foot of the lever and the asso-- main shaft of the machine. o Y ciated mandrel supporting bar 265, whereby the 24T designates a vertically reciprocative plung 'mandrel is drawn upwardly, into and from the er, the upper end of which is fixed to a vertical staple former by a continuous sweeping motion. slide i231 mounted in a vertical guideway 238 Adjacent one side of the mandrel 264 is a verinthe frame structure. This slide is connected by tically movable cutter head H8 formed with a means of a-link 242 with one arm 2437er a lever beveled vertical face 219. This head is formed 55 the resilient action of the arm 283.

on the expended free end of a horizontal lever 288 pivotally mounted at 28! in a yoke member 282 on an arm 283 which is resiliently supported by a suitable spring 284 secured thereto and to a pin 285 on the frame structure.

The beveled cutter head 218 and the adjacent end of the lever 288 are longitudinally perforated, as at 286, for the passage therethrough of a longitudinal strand of wire (W) which is threaded through a suitable guide tube 281 carried by the lever 288. The body of the wire in its passage to the tube extends between a pair of suitably-disposed feed Wheels 288 the lower of which is journaled on a stud shaft 289 projecting from the resiliently supported arm 283 and the upper of which wheels is loose on the transverse shaft 213. Secured to and movable with'the respective feed wheels 288 are intermeshing gears 298 by means of which the feed wheels are concurrently rotated by actuation of the shaft 213, and secured also to the feed wheels are two friction wheels 292, the upper of which is peripherally flattened or mutilated, as at 293. While the curved surfaces of the friction wheels are in contact the lower feed wheel is depressed against the resilient action of the arm 283 in a manner to free the wire from the bite of the feed wheels, but when the mutilated surface of the upper friction Wheel is in contact with `the surface of the lower friction wheel the latter Wheel is raised by Thus the wire is engaged by the two feed wheels and thereby intermittently advanced a limited distance to project its free end beyond the cutter head and in the upward path of the moving mandrel. The projecting wire portion, which is equal to a wire length for the formation of a staple, overlies the mandrel in the plane of the lower end of the staple former, such end being grooved for the passage of the projecting wire.

Fixed to the stationary block 24! is a vertical bar 298 having a depending cutter member 295 adjacent one side of the staple former and in close relation Ato the top of the beveled face of the perforated cutter member 218 so as to overhang the path of the projecting end of the wire. The member 295 is wedge-shaped in cross-section, its beveled face corresponding with and being substantially in the vertical plane o-f the beveled face of the movable cutter member.

The cutter bearing end of the lever 288 rests upon one arm 296 of a bell crank which is fulcrumed on a bracket 291 in the housing 2I2, the other arm 298 of the bell crank having a roll 299 which is held in contact with a suitable cam 888 fast on the driven shaft 389. The contour of the cam 388 is such that at a determined interval the bell crank is actuated to effect the oscillation of the lever 288 and the cutter member 218, the beveled edge of which latter in its upward stroke co-acts with the opposing beveled edge of the fixed cutter member 295 to sever the projecting end of the wire at an acute angle. (See Fig, 6). Immediately the wire is severed the mandrel in its upper orbital travel impinges against the opposing midportion of the wire length and carries it forcibly into the-staple former, thus bending the wire into the form of a conventional staple which is securely yet slidably held in such former. In the continued orbital movement of the mandrel it recedes from the staple former and the staple preparatory to a similar forming action on the next succeeding wire length presented to the path of the mandrel.

When the staple has been formed and positioned in the staple former the inserting plunger 2I1 descends and drives the staple into any underlying material presented thereto.

In the initial downward movement of the plunger 211 the cutter lever 288 is positively lowered at proper intervals by the impact thereon of a depending nger 38| which is secured at its upper end to the slide 241 and is slidable in a lateral extension 302 of the stationary block 24| at the bottom of the vertical guideway 238 of the frame structure. (See Fig. 1.)

It is to be understood that my invention is not limited to the particular construction disclosed, as the mechanism may be modified within the principle of the invention and the scope of the appended claims.

I claiml. The combination with a staple driving plunger and a stationary staple former through which the plunger reciprocates, of a mandrel movable under, into and from the staple former through a determined continuous orbital path, means for actuating said mandrel in timed relation to the plunger, means for intermittently projecting the free end of a wire across said mandrel when the mandrel is under the staple former, and means for severing the projecting end of the wire preparatory to the movement of the mandrel into the staple former, whereby in the entrant travel of the mandrel the severed wire is carried into the stationary staple former and therein bent to staple form.

2. The combination with a staple driving plunger and a stationary staple former through which the plunger reciprocates, of a mandrel movable in a vertical orbital path under, into and from the staple former while moving in the same general direction, means for actuating said mandrel in timed relation to the plunger, means for intermittently projecting the free end of a wire across said mandrel when the mandrel is under the staple former, and means for severing the projecting end of the wire preparatory to the movement of the mandrel into the staple former, whereby in the entrant travel of the mandrel the severed wire is carried into the stationary staple former and therein bent to staple form.

3. The combination with a staple driving plunger and a stationary staple former through which the plunger reciprocates, of a mandrel movable under, into and from the staple former through a determined continuous path, a continuously rotating crank for actuating said mandrel in an orbital path and in timed relation to the plunger, means for intermittently projecting the free end of a wire across said mandrel when the mandrel is under the staple former, and means for severing the projecting end of the wire preparatory to the movement of the mandrel into the staple former, whereby in the entrant travel of the mandrel the severed wire is carried into the stationary staple former and therein bent to staple form, said last-named means including coacting xed and movable cutter members adjacent the staple former, and means for actuating the movable cutter member.

4. The combination with a staple driving plunger and a stationary staple former through which the plunger reciprocates, of a mandrel movable under, into and from the staple former through a determined continuous orbital path, means for actuating said mandrel in timed relation to the plunger, means for intermittently projecting the free end of a Wire across said mandrel when the mandrel is under the staple former, and means for severing the projecting end of the Wire preparatory to the movement of the mandrel into the staple former, whereby in the entrant travel of the mandrel the severed Wire is carried into the stationary staple former and therein bent to staple form, said last-named means including coacting xed and movable cutter members adjacent the staple former, and means including a bell crank and cam for actuating the movable cutter member.

5. The combination with a staple driving plunger and a stationary staple former through which the plunger reciprocates, of a mandrel movable under, into and from the staple former, said mandrel being mounted on one end of a lever, slidable guide means for the other end of the lever, a shaft, a crank on the shaft connected to the mandrel lever between the mandrel and the guide, means for continuously rotating the said shaft for moving the mandrel into and from the staple former, means for actuating said mandrel in timed relation to the plunger, a cutter member in iixed relation to the staple former, a complementary movable cutter member having a wire guide, means for intermittently projecting the free end of a Wire through and beyond the said guide and across said mandrel when the mandrel is under the staple former, and means for actuating said movable Cutter in timed relation to the plunger and the mandrel whereby during the entrant travel of the mandrel the projecting wire portion is severed and carried into the stationary staple former.

WILLIAM D. LIPPS. 

